On Saturday morning, the scene is repeated all over the country: sun, coffee on the terrace, and then the engine rumbling that is being prepared at the bottom of the garage. The hindsight is waiting wisely for its hour, promise of a garden with a line before the evening barbecue. But between the desire to tame the branches and the legal reality, there is a gap that many gardeners still ignore. Before pulling the extension, it is better to unders…